Define a default skin tone in via config

[pomek]

📝 Provide a description of the new feature

By default, all emojis use the Default skin tone option as a variant.

While the feature preserves changes when a user updates the variant, it would be good to allow users to define their skin tone via the configuration option.

Hence, let's introduce the emoji.skinTone option with supported values:

type EmojiSkinTone = 'default' | 'dark' | 'medium-dark' | 'medium' | 'medium-light' | 'light';

Perhaps it should be exported from the package to make it visible in API docs.

Definition of Done

• When the emoji.skinTone option is specified, its value is used instead of default when showing the emojis.
• The' default' value is used instead if the option is missing in a configuration.
• When a user modifies the skin tone, the value is preserved (like it's now).
• Add the new option in the feature guide.

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